// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/time/time.h"

#include <limits>
#include <stdint.h>
#include <string>
#include <time.h>

#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/strings/stringprintf.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

namespace {

    TEST(TimeTestOutOfBounds, FromExplodedOutOfBoundsTime)
    {
        // FromUTCExploded must set time to Time(0) and failure, if the day is set to
        // 31 on a 28-30 day month. Test |exploded| returns Time(0) on 31st of
        // February and 31st of April. New implementation handles this.

        const struct DateTestData {
            Time::Exploded explode;
            bool is_valid;
        } kDateTestData[] = {
            // 31st of February
            { { 2016, 2, 0, 31, 12, 30, 0, 0 }, true },
            // 31st of April
            { { 2016, 4, 0, 31, 8, 43, 0, 0 }, true },
            // Negative month
            { { 2016, -5, 0, 2, 4, 10, 0, 0 }, false },
            // Negative date of month
            { { 2016, 6, 0, -15, 2, 50, 0, 0 }, false },
            // Negative hours
            { { 2016, 7, 0, 10, -11, 29, 0, 0 }, false },
            // Negative minutes
            { { 2016, 3, 0, 14, 10, -29, 0, 0 }, false },
            // Negative seconds
            { { 2016, 10, 0, 25, 7, 47, -30, 0 }, false },
            // Negative milliseconds
            { { 2016, 10, 0, 25, 7, 47, 20, -500 }, false },
            // Hours are too large
            { { 2016, 7, 0, 10, 26, 29, 0, 0 }, false },
            // Minutes are too large
            { { 2016, 3, 0, 14, 10, 78, 0, 0 }, false },
            // Seconds are too large
            { { 2016, 10, 0, 25, 7, 47, 234, 0 }, false },
            // Milliseconds are too large
            { { 2016, 10, 0, 25, 6, 31, 23, 1643 }, false },
        };

        for (const auto& test : kDateTestData) {
            EXPECT_EQ(test.explode.HasValidValues(), test.is_valid);

            base::Time result;
            EXPECT_FALSE(base::Time::FromUTCExploded(test.explode, &result));
            EXPECT_TRUE(result.is_null());
            EXPECT_FALSE(base::Time::FromLocalExploded(test.explode, &result));
            EXPECT_TRUE(result.is_null());
        }
    }

    // Specialized test fixture allowing time strings without timezones to be
    // tested by comparing them to a known time in the local zone.
    // See also pr_time_unittests.cc
    class TimeTest : public testing::Test {
    protected:
        void SetUp() override
        {
            // Use mktime to get a time_t, and turn it into a PRTime by converting
            // seconds to microseconds.  Use 15th Oct 2007 12:45:00 local.  This
            // must be a time guaranteed to be outside of a DST fallback hour in
            // any timezone.
            struct tm local_comparison_tm = {
                0, // second
                45, // minute
                12, // hour
                15, // day of month
                10 - 1, // month
                2007 - 1900, // year
                0, // day of week (ignored, output only)
                0, // day of year (ignored, output only)
                -1 // DST in effect, -1 tells mktime to figure it out
            };

            time_t converted_time = mktime(&local_comparison_tm);
            ASSERT_GT(converted_time, 0);
            comparison_time_local_ = Time::FromTimeT(converted_time);

            // time_t representation of 15th Oct 2007 12:45:00 PDT
            comparison_time_pdt_ = Time::FromTimeT(1192477500);
        }

        Time comparison_time_local_;
        Time comparison_time_pdt_;
    };

    // Test conversions to/from time_t and exploding/unexploding.
    TEST_F(TimeTest, TimeT)
    {
        // C library time and exploded time.
        time_t now_t_1 = time(NULL);
        struct tm tms;
#if defined(OS_WIN)
        localtime_s(&tms, &now_t_1);
#elif defined(OS_POSIX)
        localtime_r(&now_t_1, &tms);
#endif

        // Convert to ours.
        Time our_time_1 = Time::FromTimeT(now_t_1);
        Time::Exploded exploded;
        our_time_1.LocalExplode(&exploded);

        // This will test both our exploding and our time_t -> Time conversion.
        EXPECT_EQ(tms.tm_year + 1900, exploded.year);
        EXPECT_EQ(tms.tm_mon + 1, exploded.month);
        EXPECT_EQ(tms.tm_mday, exploded.day_of_month);
        EXPECT_EQ(tms.tm_hour, exploded.hour);
        EXPECT_EQ(tms.tm_min, exploded.minute);
        EXPECT_EQ(tms.tm_sec, exploded.second);

        // Convert exploded back to the time struct.
        Time our_time_2;
        EXPECT_TRUE(Time::FromLocalExploded(exploded, &our_time_2));
        EXPECT_TRUE(our_time_1 == our_time_2);

        time_t now_t_2 = our_time_2.ToTimeT();
        EXPECT_EQ(now_t_1, now_t_2);

        EXPECT_EQ(10, Time().FromTimeT(10).ToTimeT());
        EXPECT_EQ(10.0, Time().FromTimeT(10).ToDoubleT());

        // Conversions of 0 should stay 0.
        EXPECT_EQ(0, Time().ToTimeT());
        EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
    }

    // Test conversions to/from javascript time.
    TEST_F(TimeTest, JsTime)
    {
        Time epoch = Time::FromJsTime(0.0);
        EXPECT_EQ(epoch, Time::UnixEpoch());
        Time t = Time::FromJsTime(700000.3);
        EXPECT_EQ(700.0003, t.ToDoubleT());
        t = Time::FromDoubleT(800.73);
        EXPECT_EQ(800730.0, t.ToJsTime());
    }

#if defined(OS_POSIX)
    TEST_F(TimeTest, FromTimeVal)
    {
        Time now = Time::Now();
        Time also_now = Time::FromTimeVal(now.ToTimeVal());
        EXPECT_EQ(now, also_now);
    }
#endif // OS_POSIX

    TEST_F(TimeTest, FromExplodedWithMilliseconds)
    {
        // Some platform implementations of FromExploded are liable to drop
        // milliseconds if we aren't careful.
        Time now = Time::NowFromSystemTime();
        Time::Exploded exploded1 = { 0 };
        now.UTCExplode(&exploded1);
        exploded1.millisecond = 500;
        Time time;
        EXPECT_TRUE(Time::FromUTCExploded(exploded1, &time));
        Time::Exploded exploded2 = { 0 };
        time.UTCExplode(&exploded2);
        EXPECT_EQ(exploded1.millisecond, exploded2.millisecond);
    }

    TEST_F(TimeTest, ZeroIsSymmetric)
    {
        Time zero_time(Time::FromTimeT(0));
        EXPECT_EQ(0, zero_time.ToTimeT());

        EXPECT_EQ(0.0, zero_time.ToDoubleT());
    }

    TEST_F(TimeTest, LocalExplode)
    {
        Time a = Time::Now();
        Time::Exploded exploded;
        a.LocalExplode(&exploded);

        Time b;
        EXPECT_TRUE(Time::FromLocalExploded(exploded, &b));

        // The exploded structure doesn't have microseconds, and on Mac & Linux, the
        // internal OS conversion uses seconds, which will cause truncation. So we
        // can only make sure that the delta is within one second.
        EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
    }

    TEST_F(TimeTest, UTCExplode)
    {
        Time a = Time::Now();
        Time::Exploded exploded;
        a.UTCExplode(&exploded);

        Time b;
        EXPECT_TRUE(Time::FromUTCExploded(exploded, &b));
        EXPECT_TRUE((a - b) < TimeDelta::FromSeconds(1));
    }

    TEST_F(TimeTest, LocalMidnight)
    {
        Time::Exploded exploded;
        Time::Now().LocalMidnight().LocalExplode(&exploded);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(0, exploded.second);
        EXPECT_EQ(0, exploded.millisecond);
    }

    TEST_F(TimeTest, ParseTimeTest1)
    {
        time_t current_time = 0;
        time(&current_time);

        const int BUFFER_SIZE = 64;
        struct tm local_time = { 0 };
        char time_buf[BUFFER_SIZE] = { 0 };
#if defined(OS_WIN)
        localtime_s(&local_time, &current_time);
        asctime_s(time_buf, arraysize(time_buf), &local_time);
#elif defined(OS_POSIX)
        localtime_r(&current_time, &local_time);
        asctime_r(&local_time, time_buf);
#endif

        Time parsed_time;
        EXPECT_TRUE(Time::FromString(time_buf, &parsed_time));
        EXPECT_EQ(current_time, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, DayOfWeekSunday)
    {
        Time time;
        EXPECT_TRUE(Time::FromString("Sun, 06 May 2012 12:00:00 GMT", &time));
        Time::Exploded exploded;
        time.UTCExplode(&exploded);
        EXPECT_EQ(0, exploded.day_of_week);
    }

    TEST_F(TimeTest, DayOfWeekWednesday)
    {
        Time time;
        EXPECT_TRUE(Time::FromString("Wed, 09 May 2012 12:00:00 GMT", &time));
        Time::Exploded exploded;
        time.UTCExplode(&exploded);
        EXPECT_EQ(3, exploded.day_of_week);
    }

    TEST_F(TimeTest, DayOfWeekSaturday)
    {
        Time time;
        EXPECT_TRUE(Time::FromString("Sat, 12 May 2012 12:00:00 GMT", &time));
        Time::Exploded exploded;
        time.UTCExplode(&exploded);
        EXPECT_EQ(6, exploded.day_of_week);
    }

    TEST_F(TimeTest, ParseTimeTest2)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("Mon, 15 Oct 2007 19:45:00 GMT", &parsed_time));
        EXPECT_EQ(comparison_time_pdt_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest3)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("15 Oct 07 12:45:00", &parsed_time));
        EXPECT_EQ(comparison_time_local_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest4)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("15 Oct 07 19:45 GMT", &parsed_time));
        EXPECT_EQ(comparison_time_pdt_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest5)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("Mon Oct 15 12:45 PDT 2007", &parsed_time));
        EXPECT_EQ(comparison_time_pdt_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest6)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("Monday, Oct 15, 2007 12:45 PM", &parsed_time));
        EXPECT_EQ(comparison_time_local_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest7)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("10/15/07 12:45:00 PM", &parsed_time));
        EXPECT_EQ(comparison_time_local_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest8)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("15-OCT-2007 12:45pm", &parsed_time));
        EXPECT_EQ(comparison_time_local_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest9)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("16 Oct 2007 4:45-JST (Tuesday)", &parsed_time));
        EXPECT_EQ(comparison_time_pdt_, parsed_time);
    }

    TEST_F(TimeTest, ParseTimeTest10)
    {
        Time parsed_time;
        EXPECT_TRUE(Time::FromString("15/10/07 12:45", &parsed_time));
        EXPECT_EQ(parsed_time, comparison_time_local_);
    }

    // Test some of edge cases around epoch, etc.
    TEST_F(TimeTest, ParseTimeTestEpoch0)
    {
        Time parsed_time;

        // time_t == epoch == 0
        EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:00 +0100 1970",
            &parsed_time));
        EXPECT_EQ(0, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:00 GMT 1970",
            &parsed_time));
        EXPECT_EQ(0, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEpoch1)
    {
        Time parsed_time;

        // time_t == 1 second after epoch == 1
        EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:01 +0100 1970",
            &parsed_time));
        EXPECT_EQ(1, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:01 GMT 1970",
            &parsed_time));
        EXPECT_EQ(1, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEpoch2)
    {
        Time parsed_time;

        // time_t == 2 seconds after epoch == 2
        EXPECT_TRUE(Time::FromString("Thu Jan 01 01:00:02 +0100 1970",
            &parsed_time));
        EXPECT_EQ(2, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Thu Jan 01 00:00:02 GMT 1970",
            &parsed_time));
        EXPECT_EQ(2, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEpochNeg1)
    {
        Time parsed_time;

        // time_t == 1 second before epoch == -1
        EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:59 +0100 1970",
            &parsed_time));
        EXPECT_EQ(-1, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 1969",
            &parsed_time));
        EXPECT_EQ(-1, parsed_time.ToTimeT());
    }

    // If time_t is 32 bits, a date after year 2038 will overflow time_t and
    // cause timegm() to return -1.  The parsed time should not be 1 second
    // before epoch.
    TEST_F(TimeTest, ParseTimeTestEpochNotNeg1)
    {
        Time parsed_time;

        EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:59 GMT 2100",
            &parsed_time));
        EXPECT_NE(-1, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEpochNeg2)
    {
        Time parsed_time;

        // time_t == 2 seconds before epoch == -2
        EXPECT_TRUE(Time::FromString("Thu Jan 01 00:59:58 +0100 1970",
            &parsed_time));
        EXPECT_EQ(-2, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Wed Dec 31 23:59:58 GMT 1969",
            &parsed_time));
        EXPECT_EQ(-2, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEpoch1960)
    {
        Time parsed_time;

        // time_t before Epoch, in 1960
        EXPECT_TRUE(Time::FromString("Wed Jun 29 19:40:01 +0100 1960",
            &parsed_time));
        EXPECT_EQ(-299999999, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Wed Jun 29 18:40:01 GMT 1960",
            &parsed_time));
        EXPECT_EQ(-299999999, parsed_time.ToTimeT());
        EXPECT_TRUE(Time::FromString("Wed Jun 29 17:40:01 GMT 1960",
            &parsed_time));
        EXPECT_EQ(-300003599, parsed_time.ToTimeT());
    }

    TEST_F(TimeTest, ParseTimeTestEmpty)
    {
        Time parsed_time;
        EXPECT_FALSE(Time::FromString("", &parsed_time));
    }

    TEST_F(TimeTest, ParseTimeTestInvalidString)
    {
        Time parsed_time;
        EXPECT_FALSE(Time::FromString("Monday morning 2000", &parsed_time));
    }

    TEST_F(TimeTest, ExplodeBeforeUnixEpoch)
    {
        static const int kUnixEpochYear = 1970; // In case this changes (ha!).
        Time t;
        Time::Exploded exploded;

        t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1969-12-31 23:59:59 999 milliseconds (and 999 microseconds).
        EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
        EXPECT_EQ(12, exploded.month);
        EXPECT_EQ(31, exploded.day_of_month);
        EXPECT_EQ(23, exploded.hour);
        EXPECT_EQ(59, exploded.minute);
        EXPECT_EQ(59, exploded.second);
        EXPECT_EQ(999, exploded.millisecond);

        t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1000);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1969-12-31 23:59:59 999 milliseconds.
        EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
        EXPECT_EQ(12, exploded.month);
        EXPECT_EQ(31, exploded.day_of_month);
        EXPECT_EQ(23, exploded.hour);
        EXPECT_EQ(59, exploded.minute);
        EXPECT_EQ(59, exploded.second);
        EXPECT_EQ(999, exploded.millisecond);

        t = Time::UnixEpoch() - TimeDelta::FromMicroseconds(1001);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1969-12-31 23:59:59 998 milliseconds (and 999 microseconds).
        EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
        EXPECT_EQ(12, exploded.month);
        EXPECT_EQ(31, exploded.day_of_month);
        EXPECT_EQ(23, exploded.hour);
        EXPECT_EQ(59, exploded.minute);
        EXPECT_EQ(59, exploded.second);
        EXPECT_EQ(998, exploded.millisecond);

        t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1000);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1969-12-31 23:59:59.
        EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
        EXPECT_EQ(12, exploded.month);
        EXPECT_EQ(31, exploded.day_of_month);
        EXPECT_EQ(23, exploded.hour);
        EXPECT_EQ(59, exploded.minute);
        EXPECT_EQ(59, exploded.second);
        EXPECT_EQ(0, exploded.millisecond);

        t = Time::UnixEpoch() - TimeDelta::FromMilliseconds(1001);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1969-12-31 23:59:58 999 milliseconds.
        EXPECT_EQ(kUnixEpochYear - 1, exploded.year);
        EXPECT_EQ(12, exploded.month);
        EXPECT_EQ(31, exploded.day_of_month);
        EXPECT_EQ(23, exploded.hour);
        EXPECT_EQ(59, exploded.minute);
        EXPECT_EQ(58, exploded.second);
        EXPECT_EQ(999, exploded.millisecond);

        // Make sure we still handle at/after Unix epoch correctly.
        t = Time::UnixEpoch();
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1970-12-31 00:00:00 0 milliseconds.
        EXPECT_EQ(kUnixEpochYear, exploded.year);
        EXPECT_EQ(1, exploded.month);
        EXPECT_EQ(1, exploded.day_of_month);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(0, exploded.second);
        EXPECT_EQ(0, exploded.millisecond);

        t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1970-01-01 00:00:00 0 milliseconds (and 1 microsecond).
        EXPECT_EQ(kUnixEpochYear, exploded.year);
        EXPECT_EQ(1, exploded.month);
        EXPECT_EQ(1, exploded.day_of_month);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(0, exploded.second);
        EXPECT_EQ(0, exploded.millisecond);

        t = Time::UnixEpoch() + TimeDelta::FromMicroseconds(1000);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1970-01-01 00:00:00 1 millisecond.
        EXPECT_EQ(kUnixEpochYear, exploded.year);
        EXPECT_EQ(1, exploded.month);
        EXPECT_EQ(1, exploded.day_of_month);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(0, exploded.second);
        EXPECT_EQ(1, exploded.millisecond);

        t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1000);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1970-01-01 00:00:01.
        EXPECT_EQ(kUnixEpochYear, exploded.year);
        EXPECT_EQ(1, exploded.month);
        EXPECT_EQ(1, exploded.day_of_month);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(1, exploded.second);
        EXPECT_EQ(0, exploded.millisecond);

        t = Time::UnixEpoch() + TimeDelta::FromMilliseconds(1001);
        t.UTCExplode(&exploded);
        EXPECT_TRUE(exploded.HasValidValues());
        // Should be 1970-01-01 00:00:01 1 millisecond.
        EXPECT_EQ(kUnixEpochYear, exploded.year);
        EXPECT_EQ(1, exploded.month);
        EXPECT_EQ(1, exploded.day_of_month);
        EXPECT_EQ(0, exploded.hour);
        EXPECT_EQ(0, exploded.minute);
        EXPECT_EQ(1, exploded.second);
        EXPECT_EQ(1, exploded.millisecond);
    }

    TEST_F(TimeTest, Max)
    {
        Time max = Time::Max();
        EXPECT_TRUE(max.is_max());
        EXPECT_EQ(max, Time::Max());
        EXPECT_GT(max, Time::Now());
        EXPECT_GT(max, Time());
    }

    TEST_F(TimeTest, MaxConversions)
    {
        Time t = Time::Max();
        EXPECT_EQ(std::numeric_limits<int64_t>::max(), t.ToInternalValue());

        t = Time::FromDoubleT(std::numeric_limits<double>::infinity());
        EXPECT_TRUE(t.is_max());
        EXPECT_EQ(std::numeric_limits<double>::infinity(), t.ToDoubleT());

        t = Time::FromJsTime(std::numeric_limits<double>::infinity());
        EXPECT_TRUE(t.is_max());
        EXPECT_EQ(std::numeric_limits<double>::infinity(), t.ToJsTime());

        t = Time::FromTimeT(std::numeric_limits<time_t>::max());
        EXPECT_TRUE(t.is_max());
        EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());

#if defined(OS_POSIX)
        struct timeval tval;
        tval.tv_sec = std::numeric_limits<time_t>::max();
        tval.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
        t = Time::FromTimeVal(tval);
        EXPECT_TRUE(t.is_max());
        tval = t.ToTimeVal();
        EXPECT_EQ(std::numeric_limits<time_t>::max(), tval.tv_sec);
        EXPECT_EQ(static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1,
            tval.tv_usec);
#endif

#if defined(OS_MACOSX)
        t = Time::FromCFAbsoluteTime(std::numeric_limits<CFAbsoluteTime>::infinity());
        EXPECT_TRUE(t.is_max());
        EXPECT_EQ(std::numeric_limits<CFAbsoluteTime>::infinity(),
            t.ToCFAbsoluteTime());
#endif

#if defined(OS_WIN)
        FILETIME ftime;
        ftime.dwHighDateTime = std::numeric_limits<DWORD>::max();
        ftime.dwLowDateTime = std::numeric_limits<DWORD>::max();
        t = Time::FromFileTime(ftime);
        EXPECT_TRUE(t.is_max());
        ftime = t.ToFileTime();
        EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwHighDateTime);
        EXPECT_EQ(std::numeric_limits<DWORD>::max(), ftime.dwLowDateTime);
#endif
    }

#if defined(OS_MACOSX)
    TEST_F(TimeTest, TimeTOverflow)
    {
        Time t = Time::FromInternalValue(std::numeric_limits<int64_t>::max() - 1);
        EXPECT_FALSE(t.is_max());
        EXPECT_EQ(std::numeric_limits<time_t>::max(), t.ToTimeT());
    }
#endif

#if defined(OS_ANDROID)
    TEST_F(TimeTest, FromLocalExplodedCrashOnAndroid)
    {
        // This crashed inside Time:: FromLocalExploded() on Android 4.1.2.
        // See http://crbug.com/287821
        Time::Exploded midnight = {
            2013, // year
            10, // month
            0, // day_of_week
            13, // day_of_month
            0, // hour
            0, // minute
            0, // second
        };
        // The string passed to putenv() must be a char* and the documentation states
        // that it 'becomes part of the environment', so use a static buffer.
        static char buffer[] = "TZ=America/Santiago";
        putenv(buffer);
        tzset();
        Time t;
        EXPECT_TRUE(Time::FromLocalExploded(midnight, &t));
        EXPECT_EQ(1381633200, t.ToTimeT());
    }
#endif // OS_ANDROID

    TEST(TimeTicks, Deltas)
    {
        for (int index = 0; index < 50; index++) {
            TimeTicks ticks_start = TimeTicks::Now();
            base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
            TimeTicks ticks_stop = TimeTicks::Now();
            TimeDelta delta = ticks_stop - ticks_start;
            // Note:  Although we asked for a 10ms sleep, if the
            // time clock has a finer granularity than the Sleep()
            // clock, it is quite possible to wakeup early.  Here
            // is how that works:
            //      Time(ms timer)      Time(us timer)
            //          5                   5010
            //          6                   6010
            //          7                   7010
            //          8                   8010
            //          9                   9000
            // Elapsed  4ms                 3990us
            //
            // Unfortunately, our InMilliseconds() function truncates
            // rather than rounds.  We should consider fixing this
            // so that our averages come out better.
            EXPECT_GE(delta.InMilliseconds(), 9);
            EXPECT_GE(delta.InMicroseconds(), 9000);
            EXPECT_EQ(delta.InSeconds(), 0);
        }
    }

    static void HighResClockTest(TimeTicks (*GetTicks)())
    {
        // IsHighResolution() is false on some systems.  Since the product still works
        // even if it's false, it makes this entire test questionable.
        if (!TimeTicks::IsHighResolution())
            return;

        // Why do we loop here?
        // We're trying to measure that intervals increment in a VERY small amount
        // of time --  less than 15ms.  Unfortunately, if we happen to have a
        // context switch in the middle of our test, the context switch could easily
        // exceed our limit.  So, we iterate on this several times.  As long as we're
        // able to detect the fine-granularity timers at least once, then the test
        // has succeeded.

        const int kTargetGranularityUs = 15000; // 15ms

        bool success = false;
        int retries = 100; // Arbitrary.
        TimeDelta delta;
        while (!success && retries--) {
            TimeTicks ticks_start = GetTicks();
            // Loop until we can detect that the clock has changed.  Non-HighRes timers
            // will increment in chunks, e.g. 15ms.  By spinning until we see a clock
            // change, we detect the minimum time between measurements.
            do {
                delta = GetTicks() - ticks_start;
            } while (delta.InMilliseconds() == 0);

            if (delta.InMicroseconds() <= kTargetGranularityUs)
                success = true;
        }

        // In high resolution mode, we expect to see the clock increment
        // in intervals less than 15ms.
        EXPECT_TRUE(success);
    }

    TEST(TimeTicks, HighRes)
    {
        HighResClockTest(&TimeTicks::Now);
    }

// Fails frequently on Android http://crbug.com/352633 with:
// Expected: (delta_thread.InMicroseconds()) > (0), actual: 0 vs 0
#if defined(OS_ANDROID)
#define MAYBE_ThreadNow DISABLED_ThreadNow
#else
#define MAYBE_ThreadNow ThreadNow
#endif
    TEST(ThreadTicks, MAYBE_ThreadNow)
    {
        if (ThreadTicks::IsSupported()) {
            ThreadTicks::WaitUntilInitialized();
            TimeTicks begin = TimeTicks::Now();
            ThreadTicks begin_thread = ThreadTicks::Now();
            // Make sure that ThreadNow value is non-zero.
            EXPECT_GT(begin_thread, ThreadTicks());
            // Sleep for 10 milliseconds to get the thread de-scheduled.
            base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
            ThreadTicks end_thread = ThreadTicks::Now();
            TimeTicks end = TimeTicks::Now();
            TimeDelta delta = end - begin;
            TimeDelta delta_thread = end_thread - begin_thread;
            // Make sure that some thread time have elapsed.
            EXPECT_GT(delta_thread.InMicroseconds(), 0);
            // But the thread time is at least 9ms less than clock time.
            TimeDelta difference = delta - delta_thread;
            EXPECT_GE(difference.InMicroseconds(), 9000);
        }
    }

    TEST(TimeTicks, SnappedToNextTickBasic)
    {
        base::TimeTicks phase = base::TimeTicks::FromInternalValue(4000);
        base::TimeDelta interval = base::TimeDelta::FromMicroseconds(1000);
        base::TimeTicks timestamp;

        // Timestamp in previous interval.
        timestamp = base::TimeTicks::FromInternalValue(3500);
        EXPECT_EQ(4000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp in next interval.
        timestamp = base::TimeTicks::FromInternalValue(4500);
        EXPECT_EQ(5000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp multiple intervals before.
        timestamp = base::TimeTicks::FromInternalValue(2500);
        EXPECT_EQ(3000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp multiple intervals after.
        timestamp = base::TimeTicks::FromInternalValue(6500);
        EXPECT_EQ(7000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp on previous interval.
        timestamp = base::TimeTicks::FromInternalValue(3000);
        EXPECT_EQ(3000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp on next interval.
        timestamp = base::TimeTicks::FromInternalValue(5000);
        EXPECT_EQ(5000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());

        // Timestamp equal to phase.
        timestamp = base::TimeTicks::FromInternalValue(4000);
        EXPECT_EQ(4000,
            timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
    }

    TEST(TimeTicks, SnappedToNextTickOverflow)
    {
        // int(big_timestamp / interval) < 0, so this causes a crash if the number of
        // intervals elapsed is attempted to be stored in an int.
        base::TimeTicks phase = base::TimeTicks::FromInternalValue(0);
        base::TimeDelta interval = base::TimeDelta::FromMicroseconds(4000);
        base::TimeTicks big_timestamp = base::TimeTicks::FromInternalValue(8635916564000);

        EXPECT_EQ(8635916564000,
            big_timestamp.SnappedToNextTick(phase, interval).ToInternalValue());
        EXPECT_EQ(8635916564000,
            big_timestamp.SnappedToNextTick(big_timestamp, interval)
                .ToInternalValue());
    }

    TEST(TimeDelta, FromAndIn)
    {
        // static_assert also checks that the contained expression is a constant
        // expression, meaning all its components are suitable for initializing global
        // variables.
        static_assert(TimeDelta::FromDays(2) == TimeDelta::FromHours(48), "");
        static_assert(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180), "");
        static_assert(TimeDelta::FromMinutes(2) == TimeDelta::FromSeconds(120), "");
        static_assert(TimeDelta::FromSeconds(2) == TimeDelta::FromMilliseconds(2000),
            "");
        static_assert(
            TimeDelta::FromMilliseconds(2) == TimeDelta::FromMicroseconds(2000), "");
        static_assert(
            TimeDelta::FromSecondsD(2.3) == TimeDelta::FromMilliseconds(2300), "");
        static_assert(
            TimeDelta::FromMillisecondsD(2.5) == TimeDelta::FromMicroseconds(2500),
            "");
        EXPECT_EQ(13, TimeDelta::FromDays(13).InDays());
        EXPECT_EQ(13, TimeDelta::FromHours(13).InHours());
        EXPECT_EQ(13, TimeDelta::FromMinutes(13).InMinutes());
        EXPECT_EQ(13, TimeDelta::FromSeconds(13).InSeconds());
        EXPECT_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
        EXPECT_EQ(13, TimeDelta::FromMilliseconds(13).InMilliseconds());
        EXPECT_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
        EXPECT_EQ(13, TimeDelta::FromSecondsD(13.1).InSeconds());
        EXPECT_EQ(13.1, TimeDelta::FromSecondsD(13.1).InSecondsF());
        EXPECT_EQ(13, TimeDelta::FromMillisecondsD(13.3).InMilliseconds());
        EXPECT_EQ(13.3, TimeDelta::FromMillisecondsD(13.3).InMillisecondsF());
        EXPECT_EQ(13, TimeDelta::FromMicroseconds(13).InMicroseconds());
        EXPECT_EQ(3.456, TimeDelta::FromMillisecondsD(3.45678).InMillisecondsF());
    }

#if defined(OS_POSIX)
    TEST(TimeDelta, TimeSpecConversion)
    {
        struct timespec result = TimeDelta::FromSeconds(0).ToTimeSpec();
        EXPECT_EQ(result.tv_sec, 0);
        EXPECT_EQ(result.tv_nsec, 0);

        result = TimeDelta::FromSeconds(1).ToTimeSpec();
        EXPECT_EQ(result.tv_sec, 1);
        EXPECT_EQ(result.tv_nsec, 0);

        result = TimeDelta::FromMicroseconds(1).ToTimeSpec();
        EXPECT_EQ(result.tv_sec, 0);
        EXPECT_EQ(result.tv_nsec, 1000);

        result = TimeDelta::FromMicroseconds(
            Time::kMicrosecondsPerSecond + 1)
                     .ToTimeSpec();
        EXPECT_EQ(result.tv_sec, 1);
        EXPECT_EQ(result.tv_nsec, 1000);
    }
#endif // OS_POSIX

    // Our internal time format is serialized in things like databases, so it's
    // important that it's consistent across all our platforms.  We use the 1601
    // Windows epoch as the internal format across all platforms.
    TEST(TimeDelta, WindowsEpoch)
    {
        Time::Exploded exploded;
        exploded.year = 1970;
        exploded.month = 1;
        exploded.day_of_week = 0; // Should be unusued.
        exploded.day_of_month = 1;
        exploded.hour = 0;
        exploded.minute = 0;
        exploded.second = 0;
        exploded.millisecond = 0;
        Time t;
        EXPECT_TRUE(Time::FromUTCExploded(exploded, &t));
        // Unix 1970 epoch.
        EXPECT_EQ(INT64_C(11644473600000000), t.ToInternalValue());

        // We can't test 1601 epoch, since the system time functions on Linux
        // only compute years starting from 1900.
    }

    // We could define this separately for Time, TimeTicks and TimeDelta but the
    // definitions would be identical anyway.
    template <class Any>
    std::string AnyToString(Any any)
    {
        std::ostringstream oss;
        oss << any;
        return oss.str();
    }

    TEST(TimeDelta, Magnitude)
    {
        const int64_t zero = 0;
        EXPECT_EQ(TimeDelta::FromMicroseconds(zero),
            TimeDelta::FromMicroseconds(zero).magnitude());

        const int64_t one = 1;
        const int64_t negative_one = -1;
        EXPECT_EQ(TimeDelta::FromMicroseconds(one),
            TimeDelta::FromMicroseconds(one).magnitude());
        EXPECT_EQ(TimeDelta::FromMicroseconds(one),
            TimeDelta::FromMicroseconds(negative_one).magnitude());

        const int64_t max_int64_minus_one = std::numeric_limits<int64_t>::max() - 1;
        const int64_t min_int64_plus_two = std::numeric_limits<int64_t>::min() + 2;
        EXPECT_EQ(TimeDelta::FromMicroseconds(max_int64_minus_one),
            TimeDelta::FromMicroseconds(max_int64_minus_one).magnitude());
        EXPECT_EQ(TimeDelta::FromMicroseconds(max_int64_minus_one),
            TimeDelta::FromMicroseconds(min_int64_plus_two).magnitude());
    }

    TEST(TimeDelta, Max)
    {
        TimeDelta max = TimeDelta::Max();
        EXPECT_TRUE(max.is_max());
        EXPECT_EQ(max, TimeDelta::Max());
        EXPECT_GT(max, TimeDelta::FromDays(100 * 365));
        EXPECT_GT(max, TimeDelta());
    }

    bool IsMin(TimeDelta delta)
    {
        return (-delta).is_max();
    }

    TEST(TimeDelta, MaxConversions)
    {
        TimeDelta t = TimeDelta::Max();
        EXPECT_EQ(std::numeric_limits<int64_t>::max(), t.ToInternalValue());

        EXPECT_EQ(std::numeric_limits<int>::max(), t.InDays());
        EXPECT_EQ(std::numeric_limits<int>::max(), t.InHours());
        EXPECT_EQ(std::numeric_limits<int>::max(), t.InMinutes());
        EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InSecondsF());
        EXPECT_EQ(std::numeric_limits<int64_t>::max(), t.InSeconds());
        EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InMillisecondsF());
        EXPECT_EQ(std::numeric_limits<int64_t>::max(), t.InMilliseconds());
        EXPECT_EQ(std::numeric_limits<int64_t>::max(), t.InMillisecondsRoundedUp());

        t = TimeDelta::FromDays(std::numeric_limits<int>::max());
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromHours(std::numeric_limits<int>::max());
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromMinutes(std::numeric_limits<int>::max());
        EXPECT_TRUE(t.is_max());

        int64_t max_int = std::numeric_limits<int64_t>::max();

        t = TimeDelta::FromSeconds(max_int / Time::kMicrosecondsPerSecond + 1);
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromMilliseconds(max_int / Time::kMillisecondsPerSecond + 1);
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromMicroseconds(max_int);
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromSeconds(-max_int / Time::kMicrosecondsPerSecond - 1);
        EXPECT_TRUE(IsMin(t));

        t = TimeDelta::FromMilliseconds(-max_int / Time::kMillisecondsPerSecond - 1);
        EXPECT_TRUE(IsMin(t));

        t = TimeDelta::FromMicroseconds(-max_int);
        EXPECT_TRUE(IsMin(t));

        t = -TimeDelta::FromMicroseconds(std::numeric_limits<int64_t>::min());
        EXPECT_FALSE(IsMin(t));

        t = TimeDelta::FromSecondsD(std::numeric_limits<double>::infinity());
        EXPECT_TRUE(t.is_max());

        double max_d = max_int;

        t = TimeDelta::FromSecondsD(max_d / Time::kMicrosecondsPerSecond + 1);
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromMillisecondsD(std::numeric_limits<double>::infinity());
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromMillisecondsD(max_d / Time::kMillisecondsPerSecond * 2);
        EXPECT_TRUE(t.is_max());

        t = TimeDelta::FromSecondsD(-max_d / Time::kMicrosecondsPerSecond - 1);
        EXPECT_TRUE(IsMin(t));

        t = TimeDelta::FromMillisecondsD(-max_d / Time::kMillisecondsPerSecond * 2);
        EXPECT_TRUE(IsMin(t));
    }

    TEST(TimeDelta, NumericOperators)
    {
        double d = 0.5;
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) * d);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) / d);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) *= d);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) /= d);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            d * TimeDelta::FromMilliseconds(1000));

        float f = 0.5;
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) * f);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) / f);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) *= f);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) /= f);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            f * TimeDelta::FromMilliseconds(1000));

        int i = 2;
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) * i);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) / i);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) *= i);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) /= i);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            i * TimeDelta::FromMilliseconds(1000));

        int64_t i64 = 2;
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) * i64);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) / i64);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) *= i64);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) /= i64);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            i64 * TimeDelta::FromMilliseconds(1000));

        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) * 0.5);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) / 0.5);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) *= 0.5);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) /= 0.5);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            0.5 * TimeDelta::FromMilliseconds(1000));

        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) * 2);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) / 2);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            TimeDelta::FromMilliseconds(1000) *= 2);
        EXPECT_EQ(TimeDelta::FromMilliseconds(500),
            TimeDelta::FromMilliseconds(1000) /= 2);
        EXPECT_EQ(TimeDelta::FromMilliseconds(2000),
            2 * TimeDelta::FromMilliseconds(1000));
    }

    TEST(TimeDelta, Overflows)
    {
        // Some sanity checks.
        EXPECT_TRUE(TimeDelta::Max().is_max());
        EXPECT_TRUE(IsMin(-TimeDelta::Max()));
        EXPECT_GT(TimeDelta(), -TimeDelta::Max());

        TimeDelta large_delta = TimeDelta::Max() - TimeDelta::FromMilliseconds(1);
        TimeDelta large_negative = -large_delta;
        EXPECT_GT(TimeDelta(), large_negative);
        EXPECT_FALSE(large_delta.is_max());
        EXPECT_FALSE(IsMin(-large_negative));
        TimeDelta one_second = TimeDelta::FromSeconds(1);

        // Test +, -, * and / operators.
        EXPECT_TRUE((large_delta + one_second).is_max());
        EXPECT_TRUE(IsMin(large_negative + (-one_second)));
        EXPECT_TRUE(IsMin(large_negative - one_second));
        EXPECT_TRUE((large_delta - (-one_second)).is_max());
        EXPECT_TRUE((large_delta * 2).is_max());
        EXPECT_TRUE(IsMin(large_delta * -2));
        EXPECT_TRUE((large_delta / 0.5).is_max());
        EXPECT_TRUE(IsMin(large_delta / -0.5));

        // Test +=, -=, *= and /= operators.
        TimeDelta delta = large_delta;
        delta += one_second;
        EXPECT_TRUE(delta.is_max());
        delta = large_negative;
        delta += -one_second;
        EXPECT_TRUE(IsMin(delta));

        delta = large_negative;
        delta -= one_second;
        EXPECT_TRUE(IsMin(delta));
        delta = large_delta;
        delta -= -one_second;
        EXPECT_TRUE(delta.is_max());

        delta = large_delta;
        delta *= 2;
        EXPECT_TRUE(delta.is_max());
        delta = large_negative;
        delta *= 1.5;
        EXPECT_TRUE(IsMin(delta));

        delta = large_delta;
        delta /= 0.5;
        EXPECT_TRUE(delta.is_max());
        delta = large_negative;
        delta /= 0.5;
        EXPECT_TRUE(IsMin(delta));

        // Test operations with Time and TimeTicks.
        EXPECT_TRUE((large_delta + Time::Now()).is_max());
        EXPECT_TRUE((large_delta + TimeTicks::Now()).is_max());
        EXPECT_TRUE((Time::Now() + large_delta).is_max());
        EXPECT_TRUE((TimeTicks::Now() + large_delta).is_max());

        Time time_now = Time::Now();
        EXPECT_EQ(one_second, (time_now + one_second) - time_now);
        EXPECT_EQ(-one_second, (time_now - one_second) - time_now);

        TimeTicks ticks_now = TimeTicks::Now();
        EXPECT_EQ(-one_second, (ticks_now - one_second) - ticks_now);
        EXPECT_EQ(one_second, (ticks_now + one_second) - ticks_now);
    }

    TEST(TimeDeltaLogging, DCheckEqCompiles)
    {
        DCHECK_EQ(TimeDelta(), TimeDelta());
    }

    TEST(TimeDeltaLogging, EmptyIsZero)
    {
        TimeDelta zero;
        EXPECT_EQ("0s", AnyToString(zero));
    }

    TEST(TimeDeltaLogging, FiveHundredMs)
    {
        TimeDelta five_hundred_ms = TimeDelta::FromMilliseconds(500);
        EXPECT_EQ("0.5s", AnyToString(five_hundred_ms));
    }

    TEST(TimeDeltaLogging, MinusTenSeconds)
    {
        TimeDelta minus_ten_seconds = TimeDelta::FromSeconds(-10);
        EXPECT_EQ("-10s", AnyToString(minus_ten_seconds));
    }

    TEST(TimeDeltaLogging, DoesNotMessUpFormattingFlags)
    {
        std::ostringstream oss;
        std::ios_base::fmtflags flags_before = oss.flags();
        oss << TimeDelta();
        EXPECT_EQ(flags_before, oss.flags());
    }

    TEST(TimeDeltaLogging, DoesNotMakeStreamBad)
    {
        std::ostringstream oss;
        oss << TimeDelta();
        EXPECT_TRUE(oss.good());
    }

    TEST(TimeLogging, DCheckEqCompiles)
    {
        DCHECK_EQ(Time(), Time());
    }

    TEST(TimeLogging, ChromeBirthdate)
    {
        Time birthdate;
        ASSERT_TRUE(Time::FromString("Tue, 02 Sep 2008 09:42:18 GMT", &birthdate));
        EXPECT_EQ("2008-09-02 09:42:18.000 UTC", AnyToString(birthdate));
    }

    TEST(TimeLogging, DoesNotMessUpFormattingFlags)
    {
        std::ostringstream oss;
        std::ios_base::fmtflags flags_before = oss.flags();
        oss << Time();
        EXPECT_EQ(flags_before, oss.flags());
    }

    TEST(TimeLogging, DoesNotMakeStreamBad)
    {
        std::ostringstream oss;
        oss << Time();
        EXPECT_TRUE(oss.good());
    }

    TEST(TimeTicksLogging, DCheckEqCompiles)
    {
        DCHECK_EQ(TimeTicks(), TimeTicks());
    }

    TEST(TimeTicksLogging, ZeroTime)
    {
        TimeTicks zero;
        EXPECT_EQ("0 bogo-microseconds", AnyToString(zero));
    }

    TEST(TimeTicksLogging, FortyYearsLater)
    {
        TimeTicks forty_years_later = TimeTicks() + TimeDelta::FromDays(365.25 * 40);
        EXPECT_EQ("1262304000000000 bogo-microseconds",
            AnyToString(forty_years_later));
    }

    TEST(TimeTicksLogging, DoesNotMessUpFormattingFlags)
    {
        std::ostringstream oss;
        std::ios_base::fmtflags flags_before = oss.flags();
        oss << TimeTicks();
        EXPECT_EQ(flags_before, oss.flags());
    }

    TEST(TimeTicksLogging, DoesNotMakeStreamBad)
    {
        std::ostringstream oss;
        oss << TimeTicks();
        EXPECT_TRUE(oss.good());
    }

} // namespace

} // namespace base
